Powershift transmission gear change information

[rondeo]

The gearstick in the centre console is connected to the transmission by a mechanical cable.
Moving the gearstick to the Park position mechanically engages a lock pawl, as when the engine is off there is no fluid pressure to operate hydraulic shifters. The gearstick cable rotates a detent plate inside the gearbox which is what you feel when changing between P R N and D. There is a toothed wheel integral to the detent plate which rotates a wheel with magnets in it, these magnets are sensed by Hall effect devices in the transmission range sensor (TRS) which is directly connected to the TCM. The TCM controls gear selection with hydraulic mechanisms, using information from the TRS and various sensors integral to the TCM which sense shaft speeds, fork positions etc. Permanent faults in any of these sensors require replacement of the TCM, as they are hard wired to it. The TCM recieves the following information to enable it to select gears:

TRS, vehicle speed, engine RPM, both shaft speed sensors, engine torque from PCM over Can bus, brake signal, accelerator pedal position, transmission fluid temperature, engine temperature, steering wheel position to prevent upshifting while cornering.

When the manual position M is selected an electronic module associated with the gearstick, known as the gear shift module (GSM) sends driver gearstick plus and minus signals to the TCM over the CAN bus, so the driver has some limeted control over the gears.

Hope this is interesting and correct! Please let us (all) know if not.